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3x+z =3000
3x+1500=3000
3x =3000-1500
x =1500/3
x = 500
x+2y+z = 4000
500+2y+1500 =4000
2y = 4000-2000
2y = 2000
y = 1000
jadi x+y+z
= 500+1000+1500
= 3000